Since the 21st century，the development and utilization of Marine clean energy such as offshore wind power，offshore photovoltaic and Marine natural gas have made remarkable progress，becoming the key force in the green energy transformation. However，at present，Marine clean energy is also facing many opportunities and challenges. Problems such as technical bottleneck，environmental impact and sustainable use of resources limit its further development. In this context，it is of great significance to analyze and forecast the development of Marine clean energy in China. This report systematically reviews the development background and current status of marine clean energy，and establishes an ensemble model to forecast the future trends of China’s major marine clean energy sources. It is projected that by 2027，the gross output value of marine power will reach 81.03212 billion yuan，with the cumulative installed capacity of offshore wind power reaching 70.161123 million kilowatts. Additionally，the gross output value of marine oil and gas is expected to attain 40.308410 billion yuan，and marine natural gas production will reach 33.91156 billion cubic meters. These projections indicate that marine clean energy will continue to play a pivotal role in the energy transition. For the future，it is recommended to comprehensively promote the healthy and sustainable development of marine clean energy from multiple perspectives，including enhancing marine clean energy technologies，reducing costs，ensuring environmental protection，and fostering overall sector growth.